Camera optical lens

ABSTRACT

The present disclosure relates to optical lens, and provides a camera optical lens including eight lenses, from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens having a negative refractive power, a fifth lens having a negative refractive power, a sixth lens having a positive refractive power, a seventh lens, and an eighth lens having a negative refractive power; wherein the camera optical lens satisfies the following conditions: 0.95≤f/TTL; −4.00≤f2/f≤−1.80; and −20.00≤(R15+R16)/(R15−R16)≤−3.00. The camera optical lens can achieve good optical performance while meeting design requirements for a long focal length and ultra-thinness.

TECHNICAL FIELD

The present disclosure relates to optical lens, particularly, to acamera optical lens suitable for handheld devices, such as smart phonesand digital cameras, and imaging devices, such as monitors and PClenses.

BACKGROUND

With an emergence of smart phones in recent years, a demand forminiature camera lens is increasing day by day. However, in general,photosensitive devices of camera lens are nothing more than ChargeCoupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor(CMOS sensor). As a progress of semiconductor manufacturing technologymakes a pixel size of the photosensitive devices become smaller, inaddition to a current development trend of electronic products towardsbetter functions and thinner and smaller dimensions, miniature cameralenses with good imaging quality therefore have become a mainstream inthe market.

In order to obtain better imaging quality, the lens that istraditionally equipped in mobile phone cameras adopts a three-piece,four-piece, or even five-piece or six-piece lens structure. However,with a development of technology and an increase of diverse demands ofusers, as a pixel area of the photosensitive devices is becoming smallerand smaller and a requirement of the system on the imaging quality isimproving constantly, an eight-piece lens structure gradually appears inlens designs. Although a typical eight-piece lens already has a goodoptical performance, its refractive power, lens spacing and lens shaperemain unreasonable to some extent, resulting in that the lensstructure, which, even though, has excellent optical performance, is notable to meet the design requirement for a long focal length andultra-thinness.

SUMMARY

Some embodiments of the present disclosure provide a camera opticallens. The camera optical lens includes eight lenses, from an object sideto an image side in sequence: a first lens having a positive refractivepower, a second lens having a negative refractive power, a third lenshaving a negative refractive power, a fourth lens having a negativerefractive power, a fifth lens having a negative refractive power, asixth lens having a positive refractive power, a seventh lens, and aneighth lens having a negative refractive power. The camera optical lenssatisfies the following conditions: 0.95≤f/TTL; −4.00≤f2/f≤1.80; and−20.00≤(R15+R16/(R15−R16)≤−3.00, where TTL denotes a total opticallength from an object-side surface of the first lens to an image surfaceof the camera optical lens along an optical axis; f denotes a focallength of the camera optical lens; f2 denotes a focal length of thesecond lens; R15 denotes a central curvature radius of an object-sidesurface of the eighth lens; R16 denotes a central curvature radius of animage-side surface of the eighth lens.

As an improvement, the camera optical lens satisfies the followingcondition: 0.90≤f6/f≤2.50, where f6 denotes a focal length of the sixthlens.

As an improvement, the camera optical lens satisfies the followingconditions: 0.23≤f1/f≤0.72; −1.61≤(R1+R2)/(R1−R2)≤−0.47; and0.05≤d1/TTL≤0.20, where f1 denotes a focal length of the first lens; R1denotes a central curvature radius of an object-side surface of thefirst lens; R2 denotes a central curvature radius of an image-sidesurface of the first lens; and d1 denotes an on-axis thickness of thefirst lens.

As an improvement, the camera optical lens satisfies the followingconditions: −2.33≤(R3+R4)/(R3−R4)≤−0.30; and 0.02≤d3/TTL≤0.06, where R3denotes a central curvature radius of an object-side surface of thesecond lens; R4 denotes a central curvature radius of an image-sidesurface of the second lens; and d3 denotes an on-axis thickness of thesecond lens.

As an improvement, the camera optical lens satisfies the followingconditions: −4.05≤f3/f≤−1.07; 0.67≤(R5+R6)/(R5−R6)≤4.48; and0.02≤d5/TTL≤0.06, where f3 denotes a focal length of the third lens; R5denotes a central curvature radius of an object-side surface of thethird lens; R6 denotes a central curvature radius of an image-sidesurface of the third lens; and d5 denotes an on-axis thickness of thethird lens.

As an improvement, the camera optical lens satisfies the followingconditions: −4.46≤f4/f≤−0.99; 1.68≤(R7+R8)/(R7−R8)≤8.60; and0.02≤d7/TTL≤0.06; where f4 denotes a focal length of the fourth lens; R7denotes a central curvature radius of an object-side surface of thefourth lens; R8 denotes a central curvature radius of an image-sidesurface of the fourth lens; and d7 denotes an on-axis thickness of thefourth lens.

As an improvement, the camera optical lens satisfies the followingconditions: −5.33≤f5/f≤−1.45; −9.27≤(R9+R10)/(R9−R10)≤−2.42; and0.02≤d9/TTL≤0.06; where f5 denotes a focal length of the fifth lens; R9denotes a central curvature radius of an object-side surface of thefifth lens; R10 denotes a central curvature radius of an image-sidesurface of the fifth lens; and d9 denotes an on-axis thickness of thefifth lens.

As an improvement, the camera optical lens satisfies the followingconditions: −14.57≤(R11+R12)/(R11−R12)≤−0.78; and 0.02≤d11/TTL≤0.13;where R11 denotes a central curvature radius of an object-side surfaceof the sixth lens; R12 denotes a central curvature radius of animage-side surface of the sixth lens; and d11 denotes an on-axisthickness of the sixth lens.

As an improvement, the camera optical lens satisfies the followingconditions: −2.37≤f7/f≤127.2; −133.01≤(R13+R14)/(R13−R14)≤−0.37; and0.04≤d13/TTL≤0.20; where f7 denotes a focal length of the seventh lens;R13 denotes a central curvature radius of an object-side surface of theseventh lens; R14 denotes a central curvature radius of an image-sidesurface of the seventh lens; and d13 denotes an on-axis thickness of theseventh lens.

As an improvement, the camera optical lens satisfies the followingconditions: −56.04≤f8/f≤−1.17; and 0.03≤d15/TTL≤0.13; where f8 denotes afocal length of the eighth lens; and d15 denotes an on-axis thickness ofthe eighth lens.

As an improvement, the camera optical lens satisfies the followingconditions: f/IH≥2.00, where IH denotes an image height of the cameraoptical lens.

The present disclosure has advantages in: the camera optical lens in thepresent disclosure has good optical performance and has characteristicsof a large aperture, a long focal length and ultra-thinness, and isespecially applicable to mobile phone camera lens assemblies and WEBcamera lenses composed by such camera elements as CCD and CMOS for highpixels.

BRIEF DESCRIPTION OF DRAWINGS

To illustrate technical solutions according to embodiments of thepresent disclosure more clearly, accompanying drawings for describingthe embodiments are introduced briefly in the following. Apparently,accompanying drawings in the following description are only someembodiments of the present disclosure, and persons of ordinary skill inthe art can derive other drawings from the accompanying drawings withoutcreative efforts.

FIG. 1 is a schematic diagram of a structure of a camera optical lensaccording to Embodiment 1 of the present disclosure.

FIG. 2 is a schematic diagram of a longitudinal aberration of the cameraoptical lens shown in FIG. 1.

FIG. 3 is a schematic diagram of a lateral color of the camera opticallens shown in FIG. 1.

FIG. 4 is a schematic diagram of a field curvature and a distortion ofthe camera optical lens shown in FIG. 1.

FIG. 5 is a schematic diagram of a structure of a camera optical lensaccording to Embodiment 2 of the present disclosure.

FIG. 6 is a schematic diagram of a longitudinal aberration of the cameraoptical lens shown in FIG. 5.

FIG. 7 is a schematic diagram of a lateral color of the camera opticallens shown in FIG. 5.

FIG. 8 is a schematic diagram of a field curvature and a distortion ofthe camera optical lens shown in FIG. 5.

FIG. 9 is a schematic diagram of a structure of a camera optical lensaccording to Embodiment 3 of the present disclosure.

FIG. 10 is a schematic diagram of a longitudinal aberration of thecamera optical lens shown in FIG. 9.

FIG. 11 is a schematic diagram of a lateral color of the camera opticallens shown in FIG. 9.

FIG. 12 is a schematic diagram of a field curvature and a distortion ofthe camera optical lens shown in FIG. 9.

DETAILED DESCRIPTION OF EMBODIMENTS

To make objectives, technical solutions, and advantages of the presentdisclosure clearer, embodiments of the present disclosure are describedin detail with reference to accompanying drawings in the following. Aperson of ordinary skill in the art can understand that, in theembodiments of the present disclosure, many technical details areprovided to make readers better understand the present disclosure.However, even without these technical details and any changes andmodifications based on the following embodiments, technical solutionsrequired to be protected by the present disclosure can be implemented.

Embodiment 1

Referring to the accompanying drawing, the present disclosure provides acamera optical lens 10. FIG. 1 shows a schematic diagram of a structureof a camera optical lens 10 of Embodiment 1 of the present disclosure,and the camera optical lens 10 includes eight lenses. Specifically, thecamera optical lens 10 includes, from an object side to an image side insequence: an aperture S1, a first lens L1, a second lens L2, a thirdlens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventhlens L7 and an eighth lens L8. An optical element such as an opticalfilter GF can be arranged between the eighth lens L8 and an imagesurface Si.

In this embodiment, the first lens L1 has a positive refractive power,the second lens L2 has a negative refractive power, the third lens L3has a negative refractive power, the fourth lens L4 has a negativerefractive power, the fifth lens L5 has a negative refractive power, thesixth lens L6 has a positive refractive power, the seventh lens L7 has apositive power and the eighth lens L8 has a negative refractive power.It should be appreciated that, in other embodiments, the second lens L2,the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lensL6, the seventh lens L7 and the eighth lens L8 may have other refractivepowers than that of this embodiment. In this embodiment, the first lensL1 has a positive refractive power, which facilitates improvingperformance of the camera optical lens 10.

In this embodiment, the first lens L1, the second lens L2, the thirdlens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, theseventh lens L7 and the eighth lens L8 are made of plastic material. Inother embodiments, the lenses may be made of other materials.

In this embodiment, a total optical length from the object side surfaceof the first lens L1 to an image surface Si of the camera optical lens10 along an optical axis is defined as TTL, a focal length of the cameraoptical lens 10 is defined as f, a focal length of the second lens L2 isdefined as f2, a central curvature radius of an object-side surface ofthe eighth lens L8 is defined as R15, and a central curvature radius ofan image-side surface of the eighth lens L8 is defined as R16. Thecamera optical lens 10 satisfies the following condition: 0.95≤f/TTL(1); −4.00≤f2/f≤−1.80 (2); and −20.00≤(R15+R16)/(R15−R16)≤−3.00 (3).

The condition (1) specifies a ratio of the focal length of the cameraoptical lens 10 to the total optical length of the camera optical lens10. When the condition (1) is satisfied, given the same total opticallength TTL, the camera optical lens 10 has a longer focal length.Preferably, the camera optical lens 10 satisfies the followingcondition: 0.99≤f/TTL.

The condition (2) specifies a ratio of the focal length f2 of the secondlens L2 to the focal length f of the camera optical lens 10, which caneffectively balance a spherical aberration and a field curvature of thecamera optical lens 10.

The condition (3) specifies a shape of the eighth lens L8. Within thiscondition (3), a deflection degree of the light passing through the lenscan be alleviated, and an aberration can be effectively reduced.

A focal length of the sixth lens L6 is defined as f6. The camera opticallens 10 satisfies the following condition: 0.90≤f6/f≤2.50, whichspecifies a ratio of a focal length f6 of the sixth lens L6 to a focallength f of the camera optical lens. With a reasonable distribution ofthe refractive power, the camera optical lens 10 has better imagingquality and lower sensitivity. Preferably, the camera optical lens 10satisfies the following condition: 0.92≤f5/f≤2.21.

In this embodiment, the first lens L1 includes an object-side surfacebeing convex in a paraxial region and an image-side surface being convexin the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and afocal length of the first lens is defined as f1. The camera optical lens10 satisfies the following condition: 0.23≤f1/f≤0.72, which specifies aratio of the focal length of the first lens L1 to the focal length ofthe camera optical lens 10. Within this condition, the first lens L1 hasan appropriate positive refractive power, the correction of theaberration of the camera optical lens 10 is facilitated, and thedevelopment of the lenses towards ultra-thinness is facilitated.Preferably, the camera optical lens 10 satisfies the followingcondition: 0.36≤f1/f≤0.57.

A central curvature radius of an object-side surface of the first lensL1 is defined as R1, and a central curvature radius of an image-sidesurface of the first lens L1 is defined as R2. The camera optical lens10 satisfies the following condition: −1.61≤(R1+R2)/(R1−R2)≤−0.47. Thiscan reasonably control a shape of the first lens L1 in such a mannerthat the first lens L1 can effectively correct a spherical aberration ofthe camera optical lens. Preferably, the camera optical lens 10satisfies the following condition: −1.01≤(R1+R2)/(R1−R2)≤−0.59.

An on-axis thickness of the first lens L1 is defined as d1, and thetotal optical length of the camera optical lens 10 is defined as TTL.The camera optical lens 10 satisfies the following condition:0.05≤d1/TTL≤0.20. Within this condition, ultra-thinness can be realized.Preferably, the camera optical lens 10 satisfies the followingcondition: 0.09≤d1/TTL≤0.16.

In this embodiment, the second lens L2 includes an object-side surfacebeing concave in a paraxial region and an image-side surface beingconvex in the paraxial region.

A central curvature radius of the object-side surface of the second lensL2 is defined as R3, and a central curvature radius of the image-sidesurface of the second lens L2 is defined as R4. The camera optical lens10 satisfies the following condition: −2.33≤(R3+R4)/(R3−R4)≤−0.30, whichspecifies a shape of the second lens L2. Within this condition, thedevelopment of the lenses towards ultra-thinness would facilitatecorrecting the on-axis chromatic aberration. Preferably, the cameraoptical lens 10 satisfies the following condition:−1.46≤(R3+R4)/(R3−R4)≤−0.37.

An on-axis thickness of the second lens L2 is defines as d3, and thetotal optical length of the camera optical lens 10 is defined as TTL.The camera optical lens 10 satisfies the following condition:0.02≤d3/TTL≤0.06. Within this condition, ultra-thinness of the lensescan be realized. Preferably, the camera optical lens 10 satisfies thefollowing condition: 0.03≤d3/TTL≤0.05.

In this embodiment, the third lens L3 includes an object-side surfacebeing convex in a paraxial region and an image-side surface beingconcave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and afocal length of the third lens L3 is defined as f3. The camera opticallens 10 satisfies the following condition: −4.05≤f3/f≤−1.07. With areasonable distribution of the refractive power, the camera optical lens10 has better imaging quality and lower sensitivity. Preferably, thecamera optical lens 10 satisfies the following condition:−2.53≤f3/f≤−1.34.

A central curvature radius of an object-side surface of the third lensis defined as R5; a central curvature radius of an image-side surface ofthe third lens is defined as R6. The camera optical lens 10 satisfiesthe following condition: 0.67≤(R5+R6)/(R5−R6)≤4.48, which caneffectively control a shape of the third lens L3 and is better for theshaping of the third lens L3. Within this condition, a deflection degreeof the light passing through the lens can be alleviated, and anaberration can be effectively reduced. Preferably, the camera opticallens 10 satisfies the following condition: 1.07≤(R5+R6)/(R5−R6)≤3.58.

An on-axis thickness of the third lens L3 is defined as d5 the totaloptical length of the camera optical lens 10 is defined as TTL. Thecamera optical lens 10 satisfies the following condition:0.02≤d5/TTL≤0.06. Within this condition, ultra-thinness of the lensescan be realized. Preferably, the camera optical lens 10 satisfies thefollowing condition: 0.03≤d5/TTL≤0.05.

In this embodiment, the fourth lens L4 includes an object-side surfacebeing convex in a paraxial region and an image-side surface beingconcave in the paraxial region.

A focal length of the camera optical lens 10 is defined as f, a focallength of the fourth lens is defined as f4. The camera optical lens 10satisfies the following condition: −4.46≤f4/f≤−0.99. With a reasonabledistribution of the refractive power, the camera optical lens 10 hasbetter imaging quality and lower sensitivity. Preferably, the cameraoptical lens 10 satisfies the following condition: −2.79≤f4/f≤−1.23.

A central curvature radius of the object-side surface of the fourth lensL4 is defined as R7, and a central curvature radius of the image-sidesurface of the fourth lens L4 is defined as R8. The camera optical lens10 satisfies the following condition: 1.68≤(R7+R8)/(R7−R8)≤8.60, whichspecifies a shape of the fourth lens L4. Within this condition, thedevelopment of the lenses towards ultra-thinness would facilitatecorrecting the off-axis aberration. Preferably, the camera optical lens10 satisfies the following condition: 2.68≤(R7+R8)/(R7−R8)≤6.88.

An on-axis thickness of the fourth lens L4 is defined as d7, and thetotal optical length of the camera optical lens 10 is defined as TTL.The camera optical lens 10 satisfies the following condition:0.02≤d7/TTL≤0.06. Within this condition, ultra-thinness of the lensescan be realized. Preferably, the camera optical lens 10 satisfies thefollowing condition: 0.03≤d7/TTL≤0.05.

In this embodiment, the fifth lens L5 includes an object-side surfacebeing concave in a paraxial region and an image-side surface beingconvex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and afocal length of the fifth lens L5 is defined as f5. The camera opticallens 10 satisfies the following condition: −5.33≤f5/f≤−1.45. With areasonable distribution of the focal power, the camera optical lens 10has better imaging quality and lower sensitivity. Preferably, the cameraoptical lens 10 satisfies the following condition: −3.33≤f6/f≤−1.81.

A central curvature radius of an object-side surface of the fifth lensL5 is defined as R9, and a central curvature radius of an image-sidesurface of the fifth lens L5 is defined as R10. The camera optical lens10 satisfies the following condition: −9.27≤(R9+R10)/(R9−R10)≤−2.42,which specifies a shape of the sixth lens L5. Within this condition, thedevelopment of the lenses towards ultra-thinness would facilitatecorrecting the off-axis aberration. Preferably, the camera optical lens10 satisfies the following condition: −5.79≤(R9+R10)/(R9−R10)≤−3.03.

An on-axis thickness of the fifth lens L5 is defined as d9, and thetotal optical length of the camera optical lens 10 is defined as TTL.The camera optical lens 10 satisfies the following condition:0.02≤d9/TTL≤0.06. Within this condition, ultra-thinness of the lensescan be realized. Preferably, the camera optical lens 10 satisfies thefollowing condition: 0.03≤d9/TTL≤0.05.

In this embodiment, the sixth lens L6 includes an object-side surfacebeing convex in a paraxial region and an image-side surface beingconcave in the paraxial region.

A central curvature radius of the object-side surface of the sixth lensL6 is defined as R11, and a central curvature radius of the image-sidesurface of the sixth lens L6 is defined as R12. The camera optical lens10 satisfies the following condition: −14.57≤(R11+R12)/(R11-R12)≤−0.78,which specifies a shape of the sixth lens L6. Within this condition, thedevelopment of the lenses towards ultra-thinness would facilitatecorrecting the off-axis aberration. Preferably, the camera optical lens10 satisfies the following condition: −9.11≤(R11+R12)/(R11−R12)≤−0.97.

An on-axis thickness of the sixth lens L6 is defined as d11, and thetotal optical length of the camera optical lens 10 is defined as TTL.The camera optical lens 10 satisfies the following condition:0.02≤d11/TTL≤0.13. Within this condition, ultra-thinness of the lensescan be realized. Preferably, the camera optical lens 10 satisfies thefollowing condition: 0.04≤d11/TTL≤0.10.

In this embodiment, the seventh lens L7 includes an object-side surfacebeing concave in a paraxial region and an image-side surface beingconvex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and afocal length of the seventh lens L7 is defined as f7. The camera opticallens 10 satisfies the following condition: −2.37≤f7/f≤127.2. With areasonable distribution of the focal power, the system has betterimaging quality and lower sensitivity. Preferably, the camera opticallens 10 satisfies the following condition: −1.48≤f7/f≤101.76.

A central curvature radius of the object-side surface of the seventhlens L7 is defined as R13, and a central curvature radius of theimage-side surface of the seventh lens L7 is defined as R14. The cameraoptical lens 10 satisfies the following condition:−133.01≤(R13+R14)/(R13−R14)≤−0.37, which specifies a shape of theseventh lens L7. Within this condition, the development of the lensestowards ultra-thinness would facilitate correcting the off-axisaberration. Preferably, the camera optical lens 10 satisfies thefollowing condition: −83.13≤(R13+R14)/(R13−R14)≤−0.47.

An on-axis thickness of the seventh lens L7 is defined as d13, and thetotal optical length of the camera optical lens 10 is defined as TTL.The camera optical lens 10 satisfies the following condition:0.04≤d13/TTL≤0.20. Within this condition, ultra-thinness of the lensesis facilitated. Preferably, the camera optical lens 10 satisfies thefollowing condition: 0.07≤d13/TTL≤0.16.

In this embodiment, the eighth lens L8 includes an object-side surfacebeing concave in a paraxial region and an image-side surface beingconvex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and afocal length of the eighth lens L8 is defined as f8. The camera opticallens 10 satisfies the following condition: −56.04≤f8/f≤−1.17. With areasonable distribution of the focal power, the system has betterimaging quality and lower sensitivity. Preferably, the camera opticallens 10 satisfies the following condition: −35.03≤f8/f≤−1.47.

An on-axis thickness of the eighth lens L8 is defined as d15 and thetotal optical length of the camera optical lens 10 is defined as TTL.The camera optical lens 10 satisfies the following condition:0.03≤d15/TTL≤0.13. Within this condition, ultra-thinness of the lensescan be realized. Preferably, the camera optical lens 10 satisfies thefollowing condition: 0.05≤d15/TTL≤0.11.

In this embodiment, an image height of the camera optical lens 10 isdefined as IH, and the focal length of the camera optical lens 10 isdefined as f. The camera optical lens 10 satisfies the followingcondition: f/IH≥2.00, which facilitates achieving a long focal length ofthe camera optical lens 10.

In this embodiment, the image height of the camera optical lens 10 isdefined as IH, and the total optical length of the camera optical lens10 is defined as TTL. The camera optical lens 10 satisfies the followingcondition: TTL/IH≤2.05, which facilitates ultra-thinness of the cameraoptical lens 10.

It should be appreciated that, in other embodiments, configuration ofthe object-side surfaces and the image-side surfaces of the first lensL1, the second lens L2, the third lens L3, the fourth lens L4, the fifthlens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8may have a distribution in convex and concave other than that of theabove-discussed embodiment.

When the above relationships are satisfied, the camera optical lens 10meets the design requirements of a long focal length and ultra-thinnesswhile having excellent optical imaging performance. Based on thecharacteristics of the camera optical lens 10, the camera optical lens10 is particularly applicable to mobile camera lens assemblies and WEBcamera lenses composed of such camera elements as CCD and CMOS for highpixels.

The camera optical lens 10 will be further described with reference tothe following examples. Symbols used in various examples are shown asfollows. The focal length, on-axis distance, central curvature radius,on-axis thickness, inflexion point position, and arrest point positionare all in units of mm.

TTL: Total optical length (the distance from the object side surface ofthe first lens L1 to the image surface Si of the camera optical lensalong the optical axis) in mm.

FNO: ratio of an effective focal length and an entrance pupil diameterof the camera optical lens.

Preferably, inflexion points and/or arrest points can be arranged on theobject-side surface and/or the image-side surface of each lens, so as tosatisfy the demand for high quality imaging. The description below canbe referred for specific implementations.

The design data of the camera optical lens 10 in Embodiment 1 of thepresent disclosure are shown in Table 1 and Table 2.

TABLE 1 R d nd vd S1 ∞ d0= −0.518 R1 1.679 d1= 0.789 nd1 1.5444 v1 55.82R2 −15.511 d2= 0.030 R3 −15.233 d3= 0.250 nd2 1.6700 v2 19.39 R4−198.870 d4= 0.050 R5 36.839 d5= 0.230 nd3 1.6153 v3 25.94 R6 5.257 d6=0.030 R7 5.040 d7= 0.230 nd4 1.6700 v4 19.39 R8 2.725 d8= 0.357 R9−3.038 d9= 0.230 nd5 1.5444 v5 55.82 R10 −4.710 d10= 0.030 R11 2.326d11= 0.266 nd6 1.6700 v6 19.39 R12 3.066 d12= 1.314 R13 −4.487 d13=0.485 nd7 1.6700 v7 19.39 R14 −4.624 d14= 0.222 R15 −2.727 d15= 0.521nd8 1.5444 v8 55.82 R16 −5.388 d16= 0.200 R17 ∞ d17= 0.210 ndg 1.5168 vg64.17 R18 ∞ d18= 0.524

In the table, meanings of various symbols will be described as follows.

S1: aperture;

R: central curvature radius of an optical surface;

R1: central curvature radius of the object-side surface of the firstlens L1;

R2: central curvature radius of the image-side surface of the first lensL1;

R3: central curvature radius of the object-side surface of the secondlens L2;

R4: central curvature radius of the image-side surface of the secondlens L2;

R5: central curvature radius of the object-side surface of the thirdlens L3;

R6: central curvature radius of the image-side surface of the third lensL3;

R7: central curvature radius of the object-side surface of the fourthlens L4;

R8: central curvature radius of the image-side surface of the fourthlens L4;

R9: central curvature radius of the object-side surface of the fifthlens L5;

R10: central curvature radius of the image-side surface of the fifthlens L5;

R11: central curvature radius of the object-side surface of the sixthlens L6;

R12: central curvature radius of the image-side surface of the sixthlens L6;

R13: central curvature radius of the object-side surface of the seventhlens L7;

R14: central curvature radius of the image-side surface of the seventhlens L7;

R15: central curvature radius of the object-side surface of the eighthlens L8;

R16: central curvature radius of the image-side surface of the eighthlens L8;

R17: central curvature radius of an object-side surface of the opticalfilter GF;

R18: central curvature radius of an image-side surface of the opticalfilter GF;

d: on-axis thickness of a lens and an on-axis distance between lenses;

d0: on-axis distance from the aperture S1 to the object-side surface ofthe first lens L1;

d1: on-axis thickness of the first lens L1;

d2: on-axis distance from the image-side surface of the first lens L1 tothe object-side surface of the second lens L2;

d3: on-axis thickness of the second lens L2;

d4: on-axis distance from the image-side surface of the second lens L2to the object-side surface of the third lens L3;

d5: on-axis thickness of the third lens L3;

d6: on-axis distance from the image-side surface of the third lens L3 tothe object-side surface of the fourth lens L4;

d7: on-axis thickness of the fourth lens L4;

d8: on-axis distance from the image-side surface of the fourth lens L4to the object-side surface of the fifth lens L5;

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image-side surface of the fifth lens L5to the object-side surface of the sixth lens L6F;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image-side surface of the sixth lens L6to the object-side surface of the seventh lens L7;

d13: on-axis thickness of the seventh lens L7;

d14: on-axis distance from the image-side surface of the seventh lens L7to the object-side surface of the eighth lens L8;

d15: on-axis thickness of the eighth lens L8;

d16: on-axis distance from the image-side surface of the eighth lens L8to the object-side surface of the optical filter GF;

d17: on-axis thickness of the optical filter GF;

d18: on-axis distance from the image-side surface of the optical filterGF to the image surface Si;

nd: refractive index of the d line;

nd1: refractive index of the d line of the first lens L1;

nd2: refractive index of the d line of the second lens L2;

nd3: refractive index of the d line of the third lens L3;

nd4: refractive index of the d line of the fourth lens L4;

nd5: refractive index of the d line of the fifth lens L5;

nd6: refractive index of the d line of the sixth lens L6;

nd7: refractive index of the d line of the seventh lens L7;

nd8: refractive index of the d line of the eighth lens L8;

ndg: refractive index of the d line of the optical filter GF;

vd: abbe number;

v1: abbe number of the first lens L1;

v2: abbe number of the second lens L2;

v3: abbe number of the third lens L3;

v4: abbe number of the fourth lens L4;

v5: abbe number of the fifth lens L5;

v6: abbe number of the sixth lens L6;

v7: abbe number of the seventh lens L7;

v8: abbe number of the eighth lens L8;

vg: abbe number of the optical filter GF.

Table 2 shows aspheric surface data of the camera optical lens 10 inEmbodiment 1 of the present disclosure.

TABLE 2 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10A12 R1 −6.2931E−02 4.7647E−04 −4.6966E−04 6.2637E−03 −9.4852E−034.7387E−03 R2  6.8435E+01 2.9199E−02 −1.1775E−01 3.9445E−01 −6.4047E−015.5521E−01 R3 −8.9662E+01 7.1875E−02 −2.6819E−01 6.5273E−01 −9.2178E−017.0106E−01 R4 −2.0000E+02 1.2724E−01 −6.3881E−01 1.6199E+00 −2.1813E+001.1503E+00 R5 −1.7959E+02 2.3037E−02 −4.4074E−01 1.6752E+00 −2.8499E+002.1423E+00 R6 −1.0933E+02 7.4344E−02 −4.1258E−01 9.3556E−01 −7.5212E−011.9093E−01 R7 −8.9614E+01 1.2328E−01 −6.1150E−01 8.1657E−01  5.5696E−01−1.6114E+00  R8 −1.5446E+00 2.4769E−02 −2.3578E−01 3.2328E−01 4.9686E−01 −8.2311E−01  R9  5.6181E+00 2.8975E−01 −6.1989E−014.8227E−01  8.2567E−01 −3.8230E+00  R10 −2.9642E+01 2.8625E−01−6.0597E−01 6.3843E−01 −2.5051E−01 −3.4098E−01  R11 −3.1627E+00−6.1862E−02   1.6630E−01 −1.7861E−01   3.2413E−01 −5.0655E−01  R12−5.0822E+00 −1.3882E−01   3.9263E−01 −6.6408E−01   1.1609E+00−1.5067E+00  R13  2.2788E+00 −5.2209E−02  −3.6681E−02 7.3786E−02−7.6585E−02 5.0145E−02 R14  1.6602E+00 3.2693E−02 −1.7264E−01 2.3701E−01−1.8982E−01 9.7046E−02 R15 −3.5835E+00 1.2533E−01 −3.4320E−01 4.2086E−01−3.1336E−01 1.4957E−01 R16 −7.8952E+01 8.5397E−03 −8.6770E−02 9.3487E−02−5.8742E−02 2.3628E−02 Conic coefficient Aspheric surface coefficients kA14 A16 A18 A20 R1 −6.2931E−02  5.6850E−03 −1.0157E−02  5.7845E−03−1.2658E−03 R2  6.8435E+01 −2.3117E−01  1.2367E−02  2.2093E−02−5.3084E−03 R3 −8.9662E+01 −1.7682E−01 −1.1108E−01  8.7662E−02−1.7526E−02 R4 −2.0000E+02  7.8552E−01 −1.5650E+00  9.0298E−01−1.8926E−01 R5 −1.7959E+02  9.1063E−02 −1.3593E+00  9.2657E−01−2.1061E−01 R6 −1.0933E+02 −1.8648E+00  4.4248E+00 −3.6784E+00 1.0737E+00 R7 −8.9614E+01 −1.2979E+00  5.2397E+00 −4.5766E+00 1.3585E+00 R8 −1.5446E+00 −7.0568E−01  2.6673E+00 −2.5435E+00 8.3318E−01 R9  5.6181E+00  8.0546E+00 −1.0422E+01  7.5692E+00−2.3873E+00 R10 −2.9642E+01  4.5775E−01 −1.7334E−01 −2.1655E−02 2.5837E−02 R11 −3.1627E+00  5.1034E−01 −3.1977E−01  1.1627E−01−1.8847E−02 R12 −5.0822E+00  1.3871E+00 −8.7048E−01  3.3064E−01−5.6321E−02 R13  2.2788E+00 −2.1219E−02  6.5243E−03 −1.4420E−03 1.6010E−04 R14  1.6602E+00 −3.2304E−02  6.9032E−03 −8.7317E−04 5.0060E−05 R15 −3.5835E+00 −4.6281E−02  8.9845E−03 −9.8884E−04 4.6773E−05 R16 −7.8952E+01 −6.2241E−03  1.0448E−03 −1.0208E−04 4.4537E−06

In table 2, K is a conic coefficient, and A4, A6, A8, A10, A12, A14,A16, A18 and A20 are aspheric surface coefficients.

y=(x ² /R)/{1+[1−(k+1)(x ² /R ²)]^(1/2) }+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰+A12x ¹² +A14x ¹⁴ +A16x ¹⁶ +A18x ¹⁸ +A20x ²⁰  (4)

Herein, x denotes a vertical distance between a point in the asphericcurve and the optical axis, and y denotes an aspheric depth (i.e. avertical distance between the point having a distance of x from theoptical axis and a plane tangent to the vertex on the optical axis ofthe aspheric surface).

For convenience, an aspheric surface of each lens surface uses theaspheric surfaces shown in the above formula (4). However, the presentdisclosure is not limited to the aspheric polynomials form shown in theformula (4).

Table 3 and Table 4 show design data of inflexion points and arrestpoints of each lens of the camera optical lens 10 according toEmbodiment 1. P1R1 and P1R2 represent the object-side surface and theimage-side surface of the first lens L1, P2R1 and P2R2 represent theobject-side surface and the image-side surface of the second lens L2,P3R1 and P3R2 represent the object-side surface and the image-sidesurface of the third lens L3, P4R1 and P4R2 represent the object-sidesurface and the image-side surface of the fourth lens L4, P5R1 and P5R2represent the object-side surface and the image-side surface of thefifth lens L5, P6R1 and P6R2 represent the object-side surface and theimage-side surface of the sixth lens L6, P7R1 and P7R2 represent theobject-side surface and the image-side surface of the seventh lens L7,and P8R1 and P8R2 represent the object-side surface and the image-sidesurface of the eighth lens L8. The data in the column named “inflexionpoint position” refer to vertical distances from inflexion pointsarranged on each lens surface to the optic axis of the camera opticallens 10. The data in the column named “arrest point position” refer tovertical distances from arrest points arranged on each lens surface tothe optical axis of the camera optical lens 10.

TABLE 3 Number(s) Inflexion Inflexion Inflexion of inflexion point pointpoint points position 1 position 2 position 3 P1R1 0 / / / P1R2 2 0.5751.065 / P2R1 2 0.595 1.145 / P2R2 3 0.065 0.445 0.595 P3R1 2 0.295 0.515/ P3R2 2 0.655 0.915 / P4R1 2 0.795 0.935 / P4R2 0 / / / P5R1 0 / / /P5R2 2 0.295 0.545 / P6R1 0 / / / P6R2 0 / / / P7R1 1 1.425 / / P7R2 11.595 / / P8R1 1 1.635 / / P8R2 1 2.045 / /

TABLE 4 Number(s) of Arrest point Arrest point arrest points position 1position 2 0 0 / / 0 2 0.995 1.105 1 1 0.935 / 0 1 0.105 / 0 0 / / 0 0 // 0 0 / / 0 0 / / 2 0 / / 0 0 / / 0 0 / / 0 0 / / 0 0 / / 1 0 / / 2 11.965 / 1 0 / /

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateralcolor of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm and470 nm after passing the camera optical lens 10, respectively. FIG. 4illustrates a field curvature and a distortion with a wavelength of 555nm after passing the camera optical lens 10. A field curvature S in FIG.4 is a field curvature in a sagittal direction, and T is a fieldcurvature in a tangential direction.

In the subsequent Table 13, various parameters of Embodiments 1, 2 and 3and values corresponding to the parameters specified in the aboveconditions are shown.

As shown in Table 13, Embodiment 1 satisfies the various conditions.

In this Embodiment, an entrance pupil diameter (ENPD) of the cameraoptical lens 10 is 2.492 mm, an image height of 1.0H is 2.934 mm, and afield of view (FOV) in a diagonal direction is 47.10°. Thus, the cameraoptical lens 10 achieves a long focal length and ultra-thinness, theon-axis and off-axis chromatic aberration is sufficiently corrected,thereby achieving excellent optical performance.

Embodiment 2

Embodiment 2, is basically the same as Embodiment 1 and involves symbolshaving the same meanings as Embodiment 1. Only differences are listedbelow

Embodiment 2 provides a camera optical lens 20 structurally shown inFIG. 5. The seventh lens has a negative refractive power. The secondlens L2 includes an image-side surface being concave in the paraxialregion.

Table 5 and Table 6 show design data of a camera optical lens 20 inEmbodiment 2 of the present disclosure.

TABLE 5 R d nd vd S1 ∞ d0= −0.456 R1 1.746 d1= 0.708 nd1 1.5444 v1 55.82R2 −12.256 d2= 0.030 R3 −11.856 d3= 0.252 nd2 1.6700 v2 19.39 R4 863.826d4= 0.050 R5 12.175 d5= 0.230 nd3 1.6153 v3 25.94 R6 4.431 d6= 0.030 R74.225 d7= 0.230 nd4 1.6700 v4 19.39 R8 2.488 d8= 0.364 R9 −2.936 d9=0.230 nd5 1.5444 v5 55.82 R10 −4.872 d10= 0.030 R11 2.810 d11= 0.422 nd61.6700 v6 19.39 R12 7.338 d12= 1.073 R13 −4.305 d13= 0.803 nd7 1.6700 v719.39 R14 −46.566 d14= 0.278 R15 −3.880 d15= 0.404 nd8 1.5444 v8 55.82R16 −4.619 d16= 0.200 R17 ∞ d17= 0.210 ndg 1.5168 vg 64.17 R18 ∞ d18=0.440

Table 6 shows aspheric surface data of each lens of the camera opticallens 20 in Embodiment 2 of the present disclosure.

TABLE 6 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10A12 R1 −3.7519E−02 1.5876E−03  1.0237E−04 4.3631E−03 −1.0079E−02 1.5861E−02 R2  4.9589E+01 4.7267E−02 −1.5156E−01 4.4845E−01 −7.8388E−01 8.8232E−01 R3 −5.8300E+01 5.3821E−02 −2.1226E−01 5.8984E−01 −1.0030E+00 1.1354E+00 R4  2.0000E+02 5.7438E−02 −1.8986E−01 2.6449E−01  2.0713E−01−1.1876E+00 R5 −1.9993E+02 −1.6385E−03   3.2117E−02 −5.6805E−01  2.3349E+00 −4.8346E+00 R6 −1.2477E+02 1.8271E−02  2.7471E−01−2.3716E+00   7.3932E+00 −1.2055E+01 R7 −8.4369E+01 2.6643E−03 2.8376E−01 −2.3215E+00   7.4536E+00 −1.2207E+01 R8 −2.5305E+00−1.8958E−02   7.8613E−03 −1.8415E−01   1.0440E+00 −1.7100E+00 R9 5.5502E+00 1.8299E−01 −3.6358E−01 4.3569E−01 −4.1217E−01  4.6165E−01R10 −7.6725E+00 1.2738E−01 −1.5785E−01 3.4137E−02 −2.7860E−03 6.0355E−01 R11 −3.2388E+00 −4.9714E−02   1.8252E−01 −3.1356E−01  5.4854E−01 −6.9565E−01 R12 −9.1818E+00 −6.0488E−02   1.1983E−01−9.8670E−02   1.2740E−01 −1.2551E−01 R13  4.2691E+00 −8.1030E−02  1.0361E−03 −1.3040E−03   3.7867E−02 −9.3711E−02 R14  1.0396E+02−6.5457E−03  −9.5590E−02 1.3289E−01 −9.6764E−02  4.3216E−02 R15−4.1553E+00 1.2371E−01 −3.1950E−01 3.4078E−01 −2.0681E−01  7.6695E−02R16 −5.4782E+01 3.3830E−02 −1.5291E−01 1.5090E−01 −8.6608E−02 3.2355E−02 Conic coefficient Aspheric surface coefficients k A14 A16A18 A20 R1 −3.7519E−02 −1.7519E−02   1.2771E−02 −5.6549E−03 1.1019E−03R2  4.9589E+01 −6.6938E−01   3.3809E−01 −1.0298E−01 1.4136E−02 R3−5.8300E+01 −8.9057E−01   4.7722E−01 −1.5743E−01 2.3579E−02 R4 2.0000E+02 1.7203E+00 −1.2483E+00  4.5945E−01 −6.7460E−02  R5−1.9993E+02 5.7892E+00 −4.0674E+00  1.5652E+00 −2.5368E−01  R6−1.2477E+02 1.0659E+01 −4.5049E+00  3.3922E−01 2.4097E−01 R7 −8.4369E+011.0743E+01 −4.5584E+00  3.7673E−01 2.3189E−01 R8 −2.5305E+00 1.2814E+00−3.2889E−01 −1.2009E−01 5.1258E−02 R9  5.5502E+00 7.0720E−03 −1.1719E+00 1.5240E+00 −6.4756E−01  R10 −7.6725E+00 −1.7263E+00   2.0287E+00−1.1561E+00 2.6655E−01 R11 −3.2388E+00 5.8405E−01 −3.0801E−01 9.2969E−02 −1.2253E−02  R12 −9.1818E+00 1.2270E−01 −9.5415E−02 4.3772E−02 −8.2913E−03  R13  4.2691E+00 1.0623E−01 −6.4173E−02 2.0271E−02 −2.6026E−03  R14  1.0396E+02 −1.2182E−02   2.1156E−03−2.0684E−04 8.7198E−06 R15 −4.1553E+00 −1.7472E−02   2.3137E−03−1.5206E−04 3.0714E−06 R16 −5.4782E+01 −8.1702E−03   1.3710E−03−1.4015E−04 6.6667E−06

Table 7 and table 8 show design data of inflexion points and arrestpoints of each lens of the camera optical lens 20 in Embodiment 2 of thepresent disclosure.

TABLE 7 Number(s) of Inflexion point Inflexion point inflexion pointsposition 1 position 2 P1R1 0 / / P1R2 1 0.615 / P2R1 2 0.625 1.075 P2R20 / / P3R1 0 / / P3R2 2 0.515 0.885 P4R1 2 0.855 0.895 P4R2 0 / / P5R1 0/ / P5R2 0 / / P6R1 0 / / P6R2 0 / / P7R1 1 1.295 / P7R2 1 1.895 / P8R11 1.805 / P8R2 1 1.985 /

TABLE 8 Number(s) of arrest points Arrest point position 1 P1R1 0 / P1R20 / P2R1 0 / P2R2 0 / P3R1 0 / P3R2 0 / P4R1 0 / P4R2 0 / P5R1 0 / P5R20 / P6R1 0 / P6R2 0 / P7R1 0 / P7R2 0 / P8R1 1 2.045 P8R2 0 /

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateralcolor of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm and470 nm after passing the camera optical lens 20, respectively. FIG. 8illustrates a field curvature and a distortion of light with awavelength of 555 nm after passing the camera optical lens 20. A fieldcurvature S in FIG. 8 is a field curvature in a sagittal direction, andT is a field curvature in a tangential direction.

As shown in Table 13, Embodiment 2 satisfies the various conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the cameraoptical lens 20 is 2.405 mm, an image height of 1.0H is 2.934 mm, and afield of view (FOV) in the diagonal direction is 48.88°. Thus, thecamera optical lens 20 achieves a long focal length and ultra-thinness,the on-axis and off-axis aberration is sufficiently corrected, therebyachieving excellent optical performance.

Embodiment 3

Embodiment 3 is basically the same as Embodiment 1 and involves symbolshaving the same meanings as Embodiment 1. Only differences are listedbelow.

Embodiment 3 provides a camera optical lens 30 structurally shown inFIG. 9. In this embodiment, the seventh lens has a negative refractivepower. The second lens includes an image-side surface being concave inthe paraxial region. The seventh lens includes an image-side surfacebeing concave in the paraxial region.

Table 9 and Table 10 show design data of a camera optical lens 30 inEmbodiment 3 of the present disclosure.

TABLE 9 R d nd vd S1 ∞ d0= −0.453 R1 1.779 d1= 0.653 nd1 1.5444 v1 55.82R2 −10.346 d2= 0.049 R3 −10.154 d3= 0.250 nd2 1.6700 v2 19.39 R4 26.566d4= 0.051 R5 7.299 d5= 0.230 nd3 1.6153 v3 25.94 R6 3.637 d6= 0.033 R73.428 d7= 0.230 nd4 1.6700 v4 19. 39 R8 2.410 d8= 0.365 R9 −2.920 d9=0.232 nd5 1.5444 v5 55. 82 R10 −5.135 d10= 0.030 R11 3.472 d11= 0.507nd6 1.6700 v6 19. 39 R12 45.432 d12= 1.061 R13 −4.579 d13= 0.699 nd71.6700 v7 19. 39 R14 16.349 d14= 0.219 R15 −6.110 d15= 0.536 nd8 1.5444v8 55. 82 R16 −6.755 d16= 0.200 R17 ∞ d17= 0.210 ndg 1.5168 vg 64. 17R18 ∞ d18= 0.442

Table 10 shows aspheric surface data of each lens of the camera opticallens 30 in Embodiment 3 of the present disclosure.

TABLE 10 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10A12 R1 −9.6177E−03 2.9687E−03 −2.2295E−03 1.7588E−02 −5.4340E−021.0589E−01 R2  4.2934E+01 4.6433E−02 −1.0981E−01 3.1424E−01 −5.5873E−016.2629E−01 R3 −6.6851E+01 4.3533E−02 −1.5612E−01 4.9590E−01 −9.6895E−011.2274E+00 R4 −2.0000E+02 3.3667E−02 −1.0693E−01 1.6261E−01  1.4964E−01−8.6887E−01  R5 −1.8466E+02 2.6120E−02 −5.1640E−02 −4.3397E−01  1.9921E+00 −4.0635E+00  R6 −1.0772E+02 4.8706E−02 −8.8803E−02−4.6204E−01   1.2595E+00 −2.6114E−02  R7 −8.4769E+01 2.0855E−02 8.8411E−03 −4.4292E−01   9.8155E−01 3.8653E−01 R8 −3.1935E+00−5.2148E−02   1.5184E−01 −3.4618E−01   7.7783E−01 −9.3046E−01  R9 5.3462E+00 1.3174E−01 −2.1945E−01 2.8156E−01 −3.4143E−01 2.7948E−01 R10−5.6386E+00 7.5772E−02 −2.6526E−02 −1.0252E−01   7.3607E−02 4.2364E−01R11 −3.2315E+00 −4.2048E−02   1.7145E−01 −3.0186E−01   5.1016E−01−6.2363E−01  R12 −1.8017E+02 −4.0321E−02   5.7090E−02 1.4779E−02−9.9665E−02 2.3820E−01 R13  7.1026E+00 −1.0205E−01   2.2240E−03−8.1715E−03   6.5962E−02 −1.3189E−01  R14 −7.5811E+01 −2.7698E−02 −9.0162E−02 1.3553E−01 −9.6261E−02 4.0534E−02 R15 −5.6274E+00 6.7515E−02−2.1813E−01 2.4744E−01 −1.5015E−01 5.3847E−02 R16 −7.6804E+01 5.1997E−03−9.6606E−02 1.0743E−01 −6.8872E−02 2.9053E−02 Conic coefficient Asphericsurface coefficients k A14 A16 A18 A20 R1 −9.6177E−03 −1.2819E−019.3734E−02 −3.8237E−02 6.7156E−03 R2  4.2934E+01 −4.4463E−01 1.9249E−01−4.5163E−02 4.1948E−03 R3 −6.6851E+01 −1.0176E+00 5.3215E−01 −1.5821E−012.0040E−02 R4 −2.0000E+02  1.4491E+00 −1.3287E+00   6.6284E−01−1.3849E−01  R5 −1.8466E+02  4.9547E+00 −3.7841E+00   1.6844E+00−3.2927E−01  R6 −1.0772E+02 −3.4543E+00 5.0918E+00 −3.1220E+007.4783E−01 R7 −8.4769E+01 −3.6765E+00 5.0599E+00 −3.0933E+00 7.6015E−01R8 −3.1935E+00  5.3430E−01 7.9784E−02 −3.3155E−01 1.3042E−01 R9 5.3462E+00  5.0403E−01 −1.6226E+00   1.6566E+00 −6.4159E−01  R10−5.6386E+00 −1.1736E+00 1.3174E+00 −7.3599E−01 1.6862E−01 R11−3.2315E+00  5.0954E−01 −2.6241E−01   7.6992E−02 −9.7162E−03  R12−1.8017E+02 −3.0055E−01 2.2666E−01 −9.5839E−02 1.7738E−02 R13 7.1026E+00  1.2892E−01 −6.7611E−02   1.7846E−02 −1.7504E−03  R14 −7.5811E+O1 −1.0567E−02 1.6711E−03 −1.4650E−04 5.4438E−06 R15−5.6274E+00 −1.1633E−02 1.4445E−03 −8.8717E−05 1.7000E−06 R16−7.6804E+01 −8.2786E−03 1.5306E−03 −1.6517E−04 7.8758E−06

Table 11 and Table 12 show design data of inflexion points and arrestpoints of each lens in the camera optical lens 30 in Embodiment 3 of thepresent disclosure.

TABLE 11 Number(s) Inflexion Inflexion of inflexion point point pointsposition 1 position 2 P1R1 0 / / P1R2 1 0.685 / P2R1 2 0.595 1.075 P2R20 / / P3R1 2 0.515 0.835 P3R2 2 0.475 0.865 P4R1 2 0.835 0.945 P4R2 0 // P5R1 0 / / P5R2 0 / / P6R1 0 / / P6R2 2 0.245 0.485 P7R1 1 1.315 /P7R2 1 0.335 / P8R1 1 1.875 / P8R2 1 2.065 /

TABLE 12 Number(s) of arrest points Arrest point position 1 P1R1 0 /P1R2 0 / P2R1 0 / P2R2 0 / P3R1 0 / P3R2 0 / P4R1 0 / P4R2 0 / P5R1 0 /P5R2 0 / P6R1 0 / P6R2 0 / P7R1 0 / P7R2 1 0.545 P8R1 0 / P8R2 0 /

FIG. 10 and FIG. 11 illustrate a longitudinal aberration and a lateralcolor of light with wavelengths of 650 nm, 61 nm, 555 nm, 53 nm and 470nm after passing the camera optical lens 30, respectively. FIG. 12illustrates a field curvature and a distortion of light with awavelength of 555 m after passing the camera optical lens 30. A fieldcurvature S in FIG. 12 is a field curvature in a sagittal direction, andT is a field curvature in a tangential direction.

Table 13 in the following shows values corresponding to the conditionsaccording to the above conditions in the embodiments. Apparently, thecamera optical lens 30 in the present embodiment satisfies the aboveconditions.

In this embodiment, an entrance pupil diameter (ENPD) of the cameraoptical lens 30 is 2.387 mm, an image height of 1.0H is 2.934 mm, and afield of view (FOV) in the diagonal direction is 49.74°. Thus, thecamera optical lens 30 achieves a long focal length and ultra-thinness,the on-axis and off-axis aberration is sufficiently corrected, therebyachieving excellent optical performance.

TABLE 13 Parameters and Embodi- Embodi- Embodi- conditions ment 1 ment 2ment 3 f/TTL 1.04 1.00 0.99 f2/f −3.95 −2.90 −1.83 (R15 + R16/(R15 −R16) −3.05 −11.50 −19.95 f 6.179 5.963 5.920 f1 2.819 2.849 2.833 f2−24.410 −17.294 −10.834 f3 −9.925 −11.373 −11.989 f4 −9.142 −9.453−13.193 f5 −16.472 −14.125 −12.872 f6 12.435 6.489 5.533 f7 523.961−7.069 −5.219 f8 −10.864 −55.016 −165.891 f12 3.117 3.310 3.628 FNO 2.482.48 2.48 TTL 5.968 5.984 5.997 IH 2.934 2.934 2.934 FOV 47.10° 48.88°49.74°

It will be understood by those of ordinary skill in the art that theembodiments described above are specific examples realizing the presentdisclosure, and that in practical applications, various changes may bemade thereto in form and in detail without departing from the range andscope of the disclosure.

What is claimed is:
 1. A camera optical lens comprising eight lenses,from an object side to an image side in sequence: a first lens having apositive refractive power, a second lens having a negative refractivepower, a third lens having a negative refractive power, a fourth lenshaving a negative refractive power, a fifth lens having a negativerefractive power, a sixth lens having a positive refractive power, aseventh lens, and an eighth lens having a negative refractive power;wherein the camera optical lens satisfies the following conditions:0.95≤f/TTL;−4.00≤f2/f≤−1.80; and−20.00≤(R15+R16/(R15−R16)≤−3.00; where TTL denotes a total opticallength from an object-side surface of the first lens to an image surfaceof the camera optical lens along an optical axis; f denotes a focallength of the camera optical lens; f2 denotes a focal length of thesecond lens; R15 denotes a central curvature radius of an object-sidesurface of the eighth lens; and R16 denotes a central curvature radiusof an image-side surface of the eighth lens.
 2. The camera optical lensaccording to claim 1, wherein the camera optical lens further satisfiesthe following condition:0.90≤f6/f≤2.50; where f6 denotes a focal length of the sixth lens. 3.The camera optical lens according to claim 1, wherein the camera opticallens further satisfies the following conditions:0.23≤f1/f≤0.72;−1.61≤(R1+R2)/(R1−R2)≤−0.47; and0.05≤d1/TTL≤0.20; where f1 denotes a focal length of the first lens; R1denotes a central curvature radius of an object-side surface of thefirst lens; R2 denotes a central curvature radius of an image-sidesurface of the first lens; and d1 denotes an on-axis thickness of thefirst lens.
 4. The camera optical lens according to claim 1, wherein thecamera optical lens further satisfies the following conditions:−2.33≤(R3+R4)/(R3−R4)≤−0.30; and 0.02≤d3/TTL≤0.06; where R3 denotes acentral curvature radius of an object-side surface of the second lens;R4 denotes a central curvature radius of an image-side surface of thesecond lens; and d3 denotes an on-axis thickness of the second lens. 5.The camera optical lens according to claim 1, wherein the camera opticallens further satisfies the following conditions:−4.05≤f3/f≤−1.07;0.67≤(R5+R6)/(R5−R6)≤4.48; and0.02≤d5/TTL≤0.06; where f3 denotes a focal length of the third lens; R5denotes a central curvature radius of an object-side surface of thethird lens; R6 denotes a central curvature radius of an image-sidesurface of the third lens; and d5 denotes an on-axis thickness of thethird lens.
 6. The camera optical lens according to claim 1, wherein thecamera optical lens further satisfies the following conditions:−4.46≤f4/f≤−0.99;1.68≤(R7+R8)/(R7−R8)≤8.60; and0.02≤d7/TTL≤0.06; where f4 denotes a focal length of the fourth lens; R7denotes a central curvature radius of an object-side surface of thefourth lens; R8 denotes a central curvature radius of an image-sidesurface of the fourth lens; and d7 denotes an on-axis thickness of thefourth lens.
 7. The camera optical lens according to claim 1, whereinthe camera optical lens further satisfies the following conditions:−5.33≤f5/f≤−1.45;−9.27≤(R9+R10)/(R9−R10)≤−2.42; and0.02≤d9/TTL≤0.06; where f5 denotes a focal length of the fifth lens; R9denotes a central curvature radius of an object-side surface of thefifth lens; R10 denotes a central curvature radius of an image-sidesurface of the fifth lens; and d9 denotes an on-axis thickness of thefifth lens.
 8. The camera optical lens according to claim 1, wherein thecamera optical lens further satisfies the following conditions:−14.57≤(R11+R12)/(R11−R12)≤−0.78; and0.02≤d11/TTL≤0.13; where R11 denotes a central curvature radius of anobject-side surface of the sixth lens; R12 denotes a central curvatureradius of an image-side surface of the sixth lens; and d11 denotes anon-axis thickness of the sixth lens.
 9. The camera optical lensaccording to claim 1, wherein the camera optical lens further satisfiesthe following conditions:−2.37≤f7/f≤127.2;−133.01≤(R13+R14)/(R13−R14)≤−0.37; and0.04≤d13/TTL≤0.20; where f7 denotes a focal length of the seventh lens;R13 denotes a central curvature radius of an object-side surface of theseventh lens; R14 denotes a central curvature radius of an image-sidesurface of the seventh lens; and d13 denotes an on-axis thickness of theseventh lens.
 10. The camera optical lens according to claim 1, whereinthe camera optical lens further satisfies the following conditions:−56.04≤f8/f≤−1.17; and0.03≤d15/TTL≤0.13; where f8 denotes a focal length of the eighth lens;and d15 denotes an on-axis thickness of the eighth lens.
 11. The cameraoptical lens according to claim 1, wherein the camera optical lensfurther satisfies the following conditions:f/IH≥2.00, where IH denotes an image height of the camera optical lens.